EFFECTS OF DIETARY SUPPLEMENTAL PROTEIN-SOURCE AND A PASTEURELLA-HAEMOLYTICA TOXOID ON PERFORMANCE AND HEALTH OF NEWLY RECEIVED CALVES

Feeding high ruminal escape protein sources and administration of past eurella haemolytica toxoid were investigated in receiving calves. Resu lts indicated that with the addition of blood meal, dally gain and fee d-to-grain ratio tended to be improved. Administration of P. haemolyti ca toxoid had no effect on daily gain in native calves with low morbid ity from respiratory disease. In highly stressed calves that were tran sported for 18 hours, however, vaccination with the toxoid increased g ain and reduced the percentage of calves treated for bovine respirator y disease.